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  <title>Blockly Plane</title>
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  <h1><a href="http://blockly.googlecode.com/">Blockly</a> &gt;
      <a href="../index.html">Apps</a> &gt;
      Plane</h1>

  <ul>
    <li>English:
    <ol>
      <li><a href="1_en.html">Single variable</a></li>
      <li><a href="2_en.html">Dual variables</a></li>
    </ol>
    </li>
    <li>Vietnamese:
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      <li><a href="1_vn.html">Single variable</a></li>
      <li><a href="2_vn.html">Dual variables</a></li>
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